what's the meaning of "prosing on" in this sentence? "So, it can be quite tempting to read through your presentation while listening to someone else in the office prosing on about the next big idea." The sentence was said in the clip about multitasking and efficiency in daily life. but I couldn't find the meaning of "prose on" or "prosing on". Can anyone let me know the meaning of that? I really appreciate that. Thanks in advance!